We actually modified the core admin\security\signin.ascx.vb to add this functionality. Our mod looks something like this.

In Page_Load, after the test for IsPostback, we added something like:

            If Page.IsPostBack = False Then
                ' **************** BEGIN Core Modification **************************'
                ' save referrer to view state

                If Not Me.Request.UrlReferrer Is Nothing AndAlso Me.Request.UrlReferrer.AbsolutePath <> String.Empty Then
                    ViewState("SaveReferrer") = Me.Request.UrlReferrer.PathAndQuery
                Else
                    ViewState("SaveReferrer") = String.Empty
                End If





Then after the test for blnLogin:

            If blnLogin Then
                If objSecurity.UserLogin(txtUsername.Text, txtPassword.Text, PortalId, PortalSettings.PortalName, ipAddress, chkCookie.Checked) <> -1 Then

                    ' Store preferredlocale in cookie
                    Dim objUserInfo As UserInfo = objUsers.GetUserByUsername(PortalSettings.PortalId, txtUsername.Text)
                    CType(Page, PageBase).SetLanguage(objUserInfo.Profile.PreferredLocale)

                    ' **************** BEGIN Core Modification **************************'

                    Dim oReferrer As Object = ViewState("SaveReferrer")
                    If oReferrer Is Nothing OrElse CType(oReferrer, String) = String.Empty Then
                        'if there is no saved referrer, go to default (which is current page without querystring)
                        ' redirect browser - override is used if the user defined login tab has no signin control
                        If PortalSettings.HomeTabId <> -1 And Request.QueryString("override") Is Nothing Then
                            ' user defined tab
                            Response.Redirect(NavigateURL(PortalSettings.HomeTabId), True)
                        Else
                            Response.Redirect(NavigateURL(), True)
                        End If
                    Else
                            Dim referrerPath As String = CType(oReferrer, String)
                            Response.Redirect(referrerPath, True)
                    End If

---

I go it to work. All i had to do was change my orginal implementation. I was going to create my own refer redirect  to use a querystring with the name returnUrl and in fact the login control uses the same name just with returnurl. I guess the returnUrl through it off.

 

thanks for your time.